<?hh //strict
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the "hack" directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 */

interface IFoo {
  const string DUCK = '123';
}

class Foo implements IFoo {
}

function foo(): string {
  return Foo::DUCK;
}

